Well, proper phrasing is important here.
The FW Campfire/Singalong/Movie nightly is open to any WDW Resort guest (Fort,
DVC, other on-property). But generally NOT open to the "general public" (people visiting WDW for the day who are staying off-site.
That being said, the number of true "off property" general public guests who venture over to the FW campfire singalong (which has diminished in value since Chip & Dale no longer circulate the crowd nightly for photos and autographs since the Covid recovery) is relatively few and Disney does not want to pay a CM to try to check/enforce that. They generally only do that around the main pool during summer holidays.
Bama Ed
PS - and oh, the lazy river water feature was in the original plans for R* back in 2019. I assume that this new resort is the same design but with different wallpaper, throw pillows, and lobby theming (Tiana is the latest IP to get a push). Thus I expect a lazy river of some sort/size/simplicity to be at the new resort - I hope the name pays homage to River Country in some way.
PS - that having been said, I usually burn a cube of sugar on the end of a stick, let it catch on fire and blow it out, at least once a trip before I sit down to watch the cartoon and/or the start of the nightly movie.